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DyeIonogels: Proton-Responsive Ionogels Based on a Dye-Ionic Liquid Exhibiting Reversible Color Change

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Xie,  Zailai
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;
Institute of Chemistry, University of Potsdam;

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Huang,  Xing
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Xie, Z., Huang, X., & Taubert, A. (2014). DyeIonogels: Proton-Responsive Ionogels Based on a Dye-Ionic Liquid Exhibiting Reversible Color Change. Advanced Functional Materials, 24(19), 2837-2843. doi:10.1002/adfm.201303016.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-8165-E
Abstract
Transparent, ion-conducting, and flexible ionogels based on the room temperature ionic liquid (IL) 1-butyl-3-methylimidazolium bis(trifluoromethane sulfonyl)imide [Bmim][N(Tf)2 ], the dye-IL (DIL) 1-butyl-3-methylimidazolium methyl orange [Bmim][MO], and poly(methylmethacrylate) (PMMA) are prepared. Upon IL incorporation the thermal stability of the PMMA matrix significantly increases from 220 to 280 °C. The ionogels have a relatively high ionic conductivity of 10-4 S cm-1 at 373 K. Most importantly, the ionogels exhibit a strong and reversible color change when exposed to aqueous or organic solutions containing protons or hydroxide ions. The resulting material is thus a prototype of soft multifunctional matter featuring ionic conductivity, easy processability, response to changes in the environment, and a strong readout signal, the color change, that could be used in optical data storage or environmental sensing.